SSE progress hook crashed React when backend returned nested error
object from writeError ({"error": {"code": ..., "message": ...}})
instead of flat string. Now parses both formats correctly.
PolicyEngine.IsOwner lacked the "system" fallback that isHTTPOwnerID
already had — when owner_ids is empty, "system" user was rejected from
all backup/restore endpoints. Added consistent fallback logic.
Also added slog.Warn to all silent owner-check rejections across
backup, restore, tenant backup/restore, and S3 handlers.
viettranx
1ca49734ff